At the moment, no coin is the enemy of Bitcoin, especially Ripple. Bitcoin has its own purpose and has its userbase, it's impossible to make Bitcoin user a fan of Ripple because these coins have very different fundamentals and to say it briefly, very different fanbase. If there is a competition between cryptocurrencies and any cryptocurrency becomes a worthy competitor of Bitcoin, then it will be amazing. We shouldn't look at crypto world like this or that coin is an enemy of Bitcoin, there doesn't exist enemy crypto, there is only a better crypto and bitcoin should be progressive to be the number one cryptocurrency.
Ripple is nothing in this game, Ripple can't destroy a coin that has 37 times bigger marketcap than Ripple itself. So, I wouldn't worry about it.