guys ,looks like Bitmain released their new model for XMR mining,also post link mentioned previouly, so as far as i know, Monero team they do change their consensus algorithm a lot in the past. so if they update again, would this miner X5 be able mine or adjust accordingly? and i believe they will be not cheap 

the current Aleo stage is still in testnet3, but they are very close to the mainnet launch. You can get incentive credits. However, the testnet3 number of participants is very large and the competition is intense, some manufacturers even built the dedicated motherboard for aleo miner. Be careful investing in equipment.

Now more and more mining firms are starting to use natural energy, such as geothermal or solar energy, and more should be using the same ways later.  Or it may become a mandortory requirement many years later.

Buying equipment in a bull market is indeed riskier and more difficult to control. Generally, you have to estimate the base cost price of a piece of the miner. When they drop down around this price, you should be able to buy it, and there should be a cycle in the life cycle of the mining equipment. This crypto mining cycle article also talked about this.

Guys, recently came across a post shared in the group chats about Aleo zk mining Aleo post, and I also heard them on 2020, looks like they are going to launch the mainnet soon.
I plan to build one ZK mining miner with some of my remaining ether GPUs. Will this coin last long?