I agree that it might be different this year. Bitcoin is not stopping the ongoing high. I really don't know what's fueling this. But the important thing is as bitcoin arises altcoins arise also. I hope this affects starting projects also.
Actually things like that always have a good effect for some Altcoins, only for this year the effect is not that much because almost everyone sells Altcoins to get Bitcoin, because they also remember that Bitcoin will surpass the new ATH at the end of last year, and it turns out it is true.
This time is extremely different.
Why?
First, the all-time-highs. If you look some major altcoins, like Ethereum, Litecoin, Stellar, ADA, Ripple, their all-time-high are still not yet meet even Bitcoin already did multiple times since $20,000.
Completely different. But Ethereum is already close to its All-time-high, but Bitcoin also already close to its around $40,000 which doubled from 2017 all time high.