Bitcoin is not going to become rock solid in the near future because it is too speculative in this period of its lifecycle. We now see money flowing into altcoins and thus Bitcoin is kinda being starved. It naturally leads to thinner orderbooks but that, in turn, means Bitcoin is more susceptible to sudden dumps and pumps as there is less liquidity in the market and consequently, it takes less financial leverage to move the price in either direction
I dont think there is any guarantee that most of the altcoins they are throwing money into that is presently making bitcoin stagnant will last the way bitcoin has lasted
In fact, neither do I
Only incurable Bitcoin haters would claim that a certain altcoin is going to outlast Bitcoin just like any sane person understands that altcoins are and will remain in the future mostly speculative assets (even when compared to Bitcoin itself). And that's the exact reason why they attract so much money now that Bitcoin is slowly turning from a purely speculative asset into something else
Further, I don't think that major altcoins are going away any time soon, either. Really, what's in any new altcoin (to be created) that would make, say, Litecoin obsolete?