Yes but here it would be a huge wall because it would have the size of half the market cap (in the beginning) by investing half of the what was raised during the ICO. Maybe it could be more or less 50% of the ICO (just need to do some stats about who hold, what is lost etc...). Did a wall of that size every existed on Bitcoin ?

I don`t understand the term "buy wall".Can you explain it?
So you want to use 50% of the ICO funds to back up the value of this cryptocurrency?
Currencies listed only on one exchange platform won`t survive,because the market demand for that currency is limited.If the demand is limited ,the market liquidity will be very limited as well.

It's not a good strategy unless you have millions or billions of dollars. You are underestimating the number of sharks out there who are willing to spend a few millions just to eat you up.

It may help to some extent but believe me if you have a big FUD brigade form influential whales that wall can come crashing down in seconds. There is too much corruption and market manipulation in crypto currency trading and icos so prepare for that wall to be smashed by ruthless parties before you see your coin mooning or even attempting a lift off. I have really seen the worst of people's characters come out when it comes to crypto, I mean really gangster cut throat stuff. SORRY If what I said has burst your bubble, I say that from direct experience of launching a coin myself a few years back.

Well I am not sure but I don't think that ICOs are illegal (I'm not living in China or South Korea sorry) and the crypto-market isn't regulated so "manipulating" the price isn't illegal neither. And this could just be a way of justify to people why you do an ICO (to build this wall and make them pay for it ). You can't just launch a new coin because of this, I know that I need something new for it to go up (maybe not eBTC...)

Whales effected the price more when it was at a lower value. Whales used to crash and pump up more effectively then but now days its more of a community effort. But I still believe that whales influence the market more than we realize.

It is possible to stable the price but not for the long term. I would rather you use the 50% fund from ICO to work on development than manipulating the buy wall. When your project is delivering and people gain confidence, the price of your coin will rise naturally.