I think thats really depend on different factors. For now Im having enough holding of bitcoin and I would love to get paid in terms of Ether if I’m getting one job for that. The reason is very simple for me, for the same amount of salary I could stack up more ether coin as compared to bitcoin. If you look from eh perspective of one coin in the future then I will get more profits from the ethreum if it gets hiked. That would be good strategy to apply for getting more profits in the future. Also, getting paid in bitcoin would be expensive as it does not hike that much faster as an alt coin would do.
I don't think ethereum could increase more and replace bitcoin since bitcoin was already use by many merchant as mode of payment and only few market places accepted ethereum unlike bitcoin there are lots of stores only are accepting it and getting more popularity that i think more people right now are slowly knows about bitcoin.
So for me if someone would like to deal with me i will stay accept bitcoin as payment mode than ethereum..