I see your point and I fully understand, there's no competition indeed bitcoin will remain as a king but likewise, there are many alternative coins to choose to add to your basket and wait till the market rise back and bring that huge pump that will let us enjoy harvesting the profits that we desire. The market for alternative coins is wide.
It's more about doing your own research and analysis in order to pick the right one and enjoy your investing / trading participation.
Your money, your obligation to deal with studying the potentials of your chosen coin/s to invest your money.
I would call bitcoin a safe and low-risk investment. It may not be growing as fast as it used to, but it is a sure thing. Many altcoins also have good properties for investing, but do they have good properties for long-term investing?
I have repeatedly read on the forum the thought that bitcoin is better for long term investments and altcoins for medium to short term investments. I like this approach and support it. Altcoins go up very fast, but they go down just as fast. You can make a lot more profit on altcoins if you constantly monitor the market situation.