This is awesome and scary at the same time. A lot of huge companies are already trying to get a piece of the pie on large increments. Should there ever be a huge crash, we all know that these entities aren't as die-hard as most of us here, and would surely cut losses that'll send bitcoin into an even deeper pit.
For me it's not scary. Contrary to what you say, this type of investment funds are not going to sell Bitcoin simply because there is a moment of panic in the market, unlike what retail investors do.
To me this is good news and what I believe is that there is going to be a day in a few years when most investors in the stock market are going to be exposed in some way or another to bitcoin, either because they own a fund or stocks that have bought Bitcoin or because the companies owned allow the purchase of Bitcoin through them as happens with Paypal. This is along the lines of normalization and mass adption and is nothing but good.
Market crashes will always happen and it is one thing we cannot avoid.