I can see Bitcoin easily being overtaken during this period, this is one of the reasons I am also invested in the altcoins. Bitcoin truly seems stagnant in comparison to me, the alternatives are able to innovate much faster and already have much greater transactional capacity then Bitcoin.
Stagnant based on what, having the highest market capitulation since late 2013/early 2014, having the higher number of transactions per day than it ever did, having the by far(!) the best development team in the ecosystem? Please tell me what's the "stagnation here". Hint: Not being able to process a number of TXs that you want != stagnation.I think it is ridiclous for you to say that 2MB is not safe. We have discussed the reosons for this extensivly already, for anyone intrested just look at our post histories.
I'd use a nice word that I use for people that usually say this, but then you'd cry out to ad hominem. 2 MB is not safe, not matter how you put it, no matter what you say, it doesn't change that since it's a fact. Obviously you can use 2 MB safely if you create normal transactions. However, it's just a matter of time until someone starts constructing TXs that will DOS the whole network as validation will take too long. I am presently mining 17MB blocks on the testnet using Bitcoin Unlimited. 
I couldn't care if it were a million TB blocks, that doesn't change the fact that they're inherently unsafe and carry a huge security risk (disregarding the fact that such blocks would kill decentralization very quickly).Fortunately there are many alternatives to Bitcoin out there, I personally like Dash, and its solutions to governance, Ethereum and Monero are also both good cryptocurrencies, all of these cryptocurrencies do not have problems with scaling, Dash has a second tier, incentivizing collateralized full nodes that also vote and can handle greater load. Ethereum already has far greater capacity then Bitcoin and it will have even more in following releases. Monero simply has an adaptive blocksize, with some very interesting incentive structures to keep the blocks from becoming to large.
Dash has a very shady history behind it, I know since I was an early adopter. ETH is neither a immutable, censorship resistant nor decentralized. Additionally, they've had very troubling security problems with the DAO and now with geth. Monero will likely end up being illegal if it picks up. Don't even get my started on the transaction volume on those chains. Anything else?