As long there are many altcoins and investors are invested on it, it will prevent the the BTC price to soar high in unprecedented manner.
Umm what? I just checked myself and the top 100 in terms of change are pretty much all in the top 100 in terms of market cap. Not only that, only the top 63 actually registered any growth at all. Everything else is in negatives. I know this isn't conclusive of anything at all because it only covers 24 hours, but it does not bode well for your case.
Another thing I'd like to note is that pump and dump groups like using coins with small market caps for their bullshit because they tend to be easy to manipulate, so growth can be a non-factor of success in some cases.