The problem with Bitcoin is that so many people didn't get on the train. So now they hope it will fail so they can board a new train -- Monero, Etherium, whatever. And they go onto these forums concern trolling as if they are actually Bitcoin proponents. But suck it up. There is no other train available to you -- the next train will have exclusive membership and will actually be a rocketship (think Apple ipay) deployed simultaneously onto millions of POS, default installation in your phone, automatically connected with checking accounts for several major banks etc.
It is the analogous non-choice that we will be offered with the one-world reserve currency:
1. US dollar reserve currency hegemony over the world
2. One-world reserve currency with every nation sending a representative
These two choices are framed as being different, but in reality they are the same outcome. In both cases, the global bankster cartel is in control.
Ditto Bitcoin.
Any way, I support moving forward using Bitcoin to destroy existing banking systems and government issued currencies, and moving the world to a global digital currency (albeit I assert ultimately controlled by the banksters). Because the alternative is no better (as you point out) and at least by moving forward we bring more capital into crypto-currency (including altcoin experiments).
I agree with you there will not be another train in terms of scaling a crypto-currency to the masses before 2033. Bitcoin has this locked up already.
I do believe it may be possible to identify a market that is large but not the (lower 50% of the power-law distributed wealth curve) masses which Bitcoin can not reach and which an altcoin can. I am 80% sure about this. I don't care if the other attempts have fallen short. That doesn't rule out someone with appropriate insight creating one that hits the sweet spot. And the goal is not to topple Bitcoin (let the lower 50% have their pacifier to suck on). My thesis has been the upper 0.1% are going down with the lower 50% into the NWO. The Knowledge Age will rise up and take over by 2033. Let them have their Bitcoin in the interim. Smaller things grow faster. There is exponential growth available to the right altcoin.