My perspective, Btc has a much larger ecosystem of investors, developers and an established (and growing) number of believers. As you say, competition is good, it will keep the big coins in check. If there is ever an altcoin that develops a truly revolutionary feature be sure to see btc adopt said feature as well. You can't overlook btc's power with how vast its resources are. All that said, again, as crypto enthusiasts we should welcome new altcoins (but true altcoins not scams) that spark new ideas and technologies. The plan is to have these currencies stay.