Great post my dear @helikopterben and I am happy to share the same view: BTC dominance will only decrease as you pointed it out.
Concerning Ripple, I was lucky enough to have a lot of it but when it reached $3,3+ I sold them all.
The Total Ripple Market Cap (you have to multiply the one on CoinMarketCap X2 was bigger than BTC !) Crazy !
Take care my friend.
Sold All ? I Guess You Might Have-Had Invested Around $0.25 something ! & you have really made 3.05 USD per XRP , thatssssss aweeesssome dude :) Good Luck , Way To Go Man !