Lol! Not sure why people are so bullish about an ETF but it doesn't bring any real value on the table. It's just a method of investment that mimics the price of an asset without buying or selling that asset. So I don't see any positive impact or liquidity inflow in the crypto market due to ETF approval.
The only positive thing here is that some more people might get intrigued about Bitcoin and start learning about it.
Your last already answered your own doubts,, investors are not particularly excited about the whole Bitcoin ETF approval because they think it has the capacity to add any real value to Bitcoin, people are mostly excited and cant wait to see some of the applications approved because since SEC is an arm of the government, the Bitcoin ETF approval will finally prove to doubters that Bitcoin is indeed a legitimate currency like every other currency in the financial market.
ETF approval on its own has not the ability to add a single digit to the price of bitcoin, but it does have the ability to be a catalyst that will drive the next/coming bull run which a lot of people have been anticipating.
Oh God bless the SEC if the approval comes at a time when bitcoin halving is just a few days to go, or immediately after the halving, I think the price of Bitcoin will catapult to over $100,000 and above very easily.