I think the next halving will be the last one and will mark the end of the 4-year cycle pattern. The following ones will still have some effect, but they won't be the major catalyst for the bull runs. I expect Bitcoin to become less volatile and start acting more like traditional assets. It could deter a lot of the retail investors hoping for crazy gains in a short time, but with all the spot ETFs approved, there should be more than enough demand to compensate for it.
As much as ETFs becoming the major factor impacting the market is not necessarily a good thing, Bitcoin becoming more stable probably is. It could become more appealing to more risk-averse investors, who are looking for something closer to a reliable store of value, rather than a highly speculative and volatile instrument.