It is always a big question since 2009 but after many years, two past halvings in 2013 and 2017 as well as some past market cycles, we can see that halvings decrease block rewards for Bitcoin miners but in a correlation of Bitcoin price which increases after each halving.
Unfortunately not a causation. The increase always coincides with a rise in the popularity of Bitcoin and the effects of the halving are often either negligible or difficult to measure. I have my doubts that the halving would actually cause a significant rise in the value of Bitcoin, if any.
As the focus shifts from solving puzzles to transaction validation, more efficient and specialized equipment might be developed to optimize transaction processing and energy consumption.
It could also lead to increased decentralization since the motivation will be transaction fees rather than the creation of new coins. It could enhance the overall security of the network even more, as miners continue to compete to validate transactions honestly.
Overall, the future is exciting, and I think the shift will still be a positive development for Bitcoin.
Everyone validates transaction, and there is no actual puzzles being solved. The issue is when the cost for an adversary to execute an attack becomes too low.