Looks like OP didn't do his research well 
TLDR : Your assumption/speculation is totally inaccurate since you didn't include technology which reduce tx size, increase blocksize weight or 2nd-layer solution.
FYI, Bitcoin Core is the one of full-node client for Bitcoin. SegWit is one of implementation about block size/weight concern.
Besides, there are few proposal such as Schnorr Signature (aka Signature aggregation) and MAST which can reduce transaction size and thus allow higher TPS without change blocksize weight.
You clearly don't know about that Bitcoin using block weight limit which is 4 kWu which means maximum block size we've seen 1MB - 4MB depending on transaction/address type, but in most cases (when majority TX use SegWit) the size would be around 2-2.5MB.
That means maximum TPS on bitcoin on-chain is above 7 TPS, but AFAIK it's around 10-18 TPS now. CMIIW.
Yes, that's the risk of mining Bitcoin, but few take loses today since they thought they would get profitwhen if Bitcoin price rise.
You don't need to ask Core developer if you want make changes since Bitcoin is decentralized and anyone can propose any ideas.
Block weight eventually need to raised if we want see mass adoption even considering 2nd-layer/side-chain technology, but majority of Bitcoiner prefer reduce TX size or move TX to 2nd-layer/side-chain over block weight increase which could sacrifice decentralization.
TLDR : Your assumption/speculation is totally inaccurate since you didn't include technology which reduce tx size, increase block
Especially for Bitcoin core, who can not agree on how to scale, so, so far nothing has been implemented as far as block size is concerned. There is a lot of info to share So lets begin
FYI, Bitcoin Core is the one of full-node client for Bitcoin. SegWit is one of implementation about block size/weight concern.
Besides, there are few proposal such as Schnorr Signature (aka Signature aggregation) and MAST which can reduce transaction size and thus allow higher TPS without change block
If you are familiar with the current block size limits you already know that the Bitcoin network can handle between 3.3-7 transactions per second. (source https://en.wikipedia.org/wiki/Bitcoin_scalability_problem) So, this means that the MINIMUM block size would need to be 35mb, not 1mb, not 2mb, not 8mb, but 35mb. No one is talking about a block size that large. No one. Again back to Bitcoin core. The block size is supposed to be scalable but they refuse to even double the size from current levels.
You clearly don't know about that Bitcoin using block weight limit which is 4 kWu which means maximum block size we've seen 1MB - 4MB depending on transaction/address type, but in most cases (when majority TX use SegWit) the size would be around 2-2.5MB.
That means maximum TPS on bitcoin on-chain is above 7 TPS, but AFAIK it's around 10-18 TPS now. CMIIW.
One final thought: When the Bitcoin price rises mining becomes more profitable and the Hash rate will rise as more miners plug in to compete for the rewards. As prices fall, mining becomes less profitable and people will unplug their miners causing the hash rate to fall. Its not the other way around. Just because the hash rate goes up it does NOT mean that the price of Bitcoin will also go up in order to support all the miners. It is possible to lose money mining Bitcoin.
Yes, that's the risk of mining Bitcoin, but few take loses today since they thought they would get profit
This has been a brief summary of my thoughts The more we crunch these types of numbers the more obvious it becomes that the current situation on the Bitcoin network is a recipe for failure. The block size must be changed. We Better start asking the core guys really nice if they would like to go ahead and save the network, or are we doomed to live by their indecision forever? What are the motives to stay the same?
You don't need to ask Core developer if you want make changes since Bitcoin is decentralized and anyone can propose any ideas.
Block weight eventually need to raised if we want see mass adoption even considering 2nd-layer/side-chain technology, but majority of Bitcoiner prefer reduce TX size or move TX to 2nd-layer/side-chain over block weight increase which could sacrifice decentralization.