You dont need to wait for the time that all coins will be like the price of bitcoin its much better if you do your research.
All you need is to observe the market price, be wise, and Have faith to yourself and coins.
If you go 50/50 in bitcoin or ethereum thats a good idea also but for me bitcoin is the better than ethereum because bitcoin is more popular to the people also it already announce that other stores in Japan is accepting bitcoin and its already have effect to the price of bitcoin because Japan is popular country and has good reputation in technology
So many people will reasearch about bitcoin because its already in the news so the demand of bitcoin will increase means the price of bitcoin will increase.
Most especially that the world of crypto is filled with so many coins with huge prospects and is still undervalued at the moment. It all has to do with research and for someone who can do a pretty good research on crypto since it is about holding for the long term anyway; they would really do well in the long run with some high level of profits.
I think you should invest both. Bitcoin investment is more stable but profit is not as great as Etherum because Etherum is much cheaper than Bitcoin, which makes Etherum easier to price than bitcoin. But investing in bitcoins is still a very safe channel.
Yeah, there is no harm in diversifying one's portfolio. They both have great prospect and will surely do well in the long run. Bitcoin is one coin that would always be consistent with making of great profit since it is the currency in the limelight, but Ethereum as well is gradually getting there and in the future, these coins can really give some good profit.