Do you think Altcoins will perform better than Bitcoin? I don't think so, because Bitcoin has reached high price which it will be difficult for altcoins price to reach in 10 years to come, because their price is still low for their investors to experience such price from the market like what Bitcoin investors has experienced few weeks ago before the price started reducing from the market till this current price. If you are talking about when the altcoins bullish season will appear, I believe, it will appear very soon, and all you need to do is to continue holding your altcoins for you to achieve income that will make you to invest in Bitcoin to fulfill your desire and it will increase your income massively in the future. I think, you will meet up with the bearish season, because the price of Bitcoin has started decreasing to allow their investors to purchase again and you can be luck to be part of that season to purchase Bitcoin and hold for future purpose.
In the last 6 months, Bitcoin has increased around 150%. Some altcoins I hold have seen 1000% increase and some over 3000%.
This is why I buy altcoins , to make a lot more money then I would if I had only invested in Bitcoin.
I can then put profits I make from my altcoins this bull run into Bitcoin in the next bear market.
Because even if many altcoins will go up in value once the price of bitcoin goes up, there are many altcoins that will collapse way before that happens, and if you are invested in one of those coins when that happens, your losses can cause irremediable damage to your portfolio.