Like I said you are confusing speculators with people who buy because they need housing, and of course it matters if the market is being driven by speculation, or not. Speculators buy to tenant out,
but they can't do that easily if vacancy rates are high, these people are weak holders and they will be the first to bail when they cannot service their mortgages on the empty units any longer. This will inevitably put downward pressure on prices, its a matter of when, and not if.
You do not have any statistics to prove that vacancy rates are not rising, or that they will cease to rise any time soon, or do you think vacancy rates do not have any impact on home prices?

I should remind you that history says you are wrong though.
TDSR is unlikely to be removed, not even in a downturn. Frankly speaking 60% isn't even remotely draconian, spending 60% of one's disposable income on servicing loans alone is pretty crazy.
The other cooling measures like ABSD will be removed at some point, but I doubt it will have a lasting impact on prices. Very few investors will be interested in buying a property if he cannot rent out his unit easily, in the end everything still hinges on vacancy rates.
I admire your optimism but I think there is very little basis for that now, property isn't going to do well in the next few years, in fact I'd consider myself lucky if I don't see a massive drop in the value of my property.