Many people tells BTG will become another failure. What is the base in this? Can this be true?
Yes that is probably true, but to be honest I think I prefer them to bcash. At least they are trying to make a real adjustment to the technology, that is making this coin asic resistant, and it should be mined with GPU. This will make it easier to mine for everyone. I think this is their main goal, making mining decentralized again. Not saying this is important or not, or that I agree with it. I will probably mine some, if their price is not to low, and it gets profitable to do so. Bcash only did the block change, and I don't see that as a big improvement, because I still prefer the possibilities from the lightning network.
BTX in my opinion does it bigger, better and has been released in April already. I don't see any need for btg.