Frankly, if Bitcoin failed due to inability to reach consensus over something as trivial as max block size, then it would show that the entire concept of decentralised cryptocurrencies is a joke. Every crypto will face similar problems sooner or later, and it could also fail, unless it's centralised or have only one influential dev.
On subject, apart from BTC I use/own doge, monero, clams and ethereum so I'd probably stick to these.
This is exactly how I feel about the current debate. That's why I am pretty confident that we will over become the current problems and exit stronger out of this mess.
We might see price decreases as a result of the current block size debate, but this should also be just temporary!