4 years is quite a long time in real estate terms. You'll never know what will happen by then. But I think one rule is usually right. If that area has no more land, then whoever wants it will need to pay more.
Puchong is already a well-known sustainable and good township. 4 years from now, it can only be better, with development pushing towards the putra jaya site. So, land value should go up here in Puchong Jaya.
And, the development is very nice with high end facilities. Access roads are reasonable to KL, PJ, and airport.
Of course, better to have strong holding power before you commit. Go see the show house and you'll like it. High price/high entry/no DIBS/etc also means less speculations and rich (and hopefully decent) neighbours. So, if can't flip, go there and enjoy the facilities until market recover.
4 years from now, I think 800k is a smaller figure. Put the down payment now and manage your finance for the next 48 months, plenty of times.
And, our society is already polarized. Rich will get richer and poor will get poorer. And, rich will want to buy up high end and price will be less elastic as comparing to mid/low cost development.
Puteri Hill is way over price (for today money) at 1 mil at that location. That's why it's very slow.
Skyz I think is at the right price for this location.
And, usually, buta-buta people make money. Investment is always blessed or cursed by luck.
So, I think it's a good buy.
You view might be correct but your credibility drops to close to ZERO because you are a new forumer. Kakaka ....