Yes, I think it is a bad idea to convert from bitcoin to ethereum but we are seeing huge potential in Bitcoin. Of course, if you find potential better convert 50% of your bitcoin to ethereum because there is huge chance the price of ETH will increase surely.
Yeah, they both are really good at their own ways, so I think it is kind of extreme to buy all of one type for another, it may be better to hold both of them, though I recommend holding bitcoin in the most part.