To me it seems like there have been talks about BTC becoming scalable for many years now. BTC is decentralized and secure no doubt, but if we don't solve scalability, how can this ever work out? And if BTC doesn't solve the trifecta, perhaps an altcoin will; before bitcoin does.
An advise anyways, dont complicate things together, comparing bitcoin with altcoins in scalability and chances of overtaken bitcoin isn't a good idea welcome on bitcoin board here, bitcoin has nothing to do with having challenges with scalability, the only aspect you expect scalability to function well is on centralized system which that's all where alts belong, there will always be restriction and bitcoin has come to provide a solution to that, if you adopt the use of bitcoin then you stand the chance to enjoy it's benefit, part of which is the scalability challenges with centralized authorities.
That's just nonsense. People have been discussing altcoins and comparing them to Bitcoin since the very beginnings. What should the OP be afraid of? This is a platform for open discussion, not an echo chamber where everyone agrees with each other.
And what do you mean by "the only aspect you expect scalability to function well is on centralized system which that's all where alts belong"? That just doesn't make sense. Where did you get the idea that all alts belong to a centralized system?