The block halving is just one aspect. We have LN on top of that, and the most important short term development will be the potential ETF approval this year or next year.
The halving is a very important supply event though, and what really matters is supply/demand. Even though everyone knows it's coming (and so people think it's priced in), I think history has shown it has a strong psychological effect.
I don't get too caught up on fundamentals anyway, because it's too hard to gauge their effects on the market (beyond "strong fundamentals, long term bullish").
If this ETF gets approved, then prepare for one heck of a bull run. The main difference is that with the upcoming ETF retail traders are more or less excluded due to the very steep entry point of 25BTC per share. What makes this a bullish event is that this ETF will be backed with actual coin supply. With futures you buy an empty non existing product, with this ETF there is underlying value of the asset itself. Coins are being taken out of circulation, and that's all that matters.
We need more use cases where coins are being taken out of circulation. This ETF is one and LN will be one.
You never know. It depends on the market cycle. If an ETF is approved well into a bull run, it could just be time for a blow-off top (like with the CME futures listing). ETFs can also be shorted, and I imagine inverse ETFs won't be far behind either.
Also, it's my understanding that the coins backing the Winklevoss Trust are already removed from supply (they already own them). Not totally sure about SolidX or others, but I wouldn't assume that upon approval, hundreds of thousands of BTC need to be immediately bought to back the ETF.