It surely would be nice to find that graph. Ans surely I'd say that the biggest POSITIVE impact on Bitcoin's price would happen if pension funds would invest in Bitcoins. However, we could think also at Black Swans even - like for instance Satoshi Nakamoto suddenly putting on sale his 1 Million Bitcoins. This also would have one of the biggest impact on Bitcoin's price...
Pension funds usually have a clear mandate about where they can deploy their funds. In spite of how Bitcoin and other cryptocurrencies have grown, they are a risky asset class. Maybe when we have more regulations, a well developed market with crypto-ETFs, then maybe some pension funds could consider investing in cryptocurrencies. Until then, it will be a strict no-no.