@Wary
There is nothing to prevent all the service providers to switch from BTC to ETH if the tide turns. Bitcoins competitive advantage could quickly turn into Ethereums competitive advantage.
All being equal I'd still say it would be unlikely, but things aren't equal.
Core is planning segwit in April and maybe a hard fork in 2017, somewhat dependent on whether some of the other witchcraft they're planning will get them close to an "effective block size" of max 4MB.
In that same period Ethereum is pushing ahead with a unique approach to PoS, which sounds like it will ensure transaction verification decentralization way better than Bitcoin (not really a high bar nowadays). They've already got adaptive block size and are working on sharding, among other things, to deal with scalability. With the new funding they're pushing ahead with the Mist browser which will make it possible to run and manage Dapps and smart contracts in an easy to use and intuitive GUI environment.
Through all of this, and of course not focusing so much on money, they appeal to a much broader user base than the right wing nutters (no offense) who's traditionally been attracted to Bitcoin.