The US real estate recovery since 2009 goes to show the folly of calling real estate bubbles. A lot of countries that people were calling a bubble in the 2000s, never dipped, they actually went higher (I'm referring to some european markets, Australia and some others). But even the ones that did (the US), it was quick to recover (a lot of US markets are close to or higher than previous peak) and the whole thing was a buying opportunity (REITs are up 200% since then).
So the bubble callers only would have benefited from the bubble calling if they timed their sales well (meaning, they werent calling it a bubble in 2001 or 2002 but did so closer to the peak in 2005 or 2006), THEN they turned bullish when things bottomed out, they bought again. Now, keep in mind they would have to pay cap gains taxes when they sold because they didn't immediatly rebought it (IIRC, there is a tax relief of this kind in the US for the primary residence).
Its a high wire act to try to outperform buy and hold this way, specially when you consider the transaction costs in real estate, which are exorbitant
This is why I'm buying brazilian REITs despite people calling it a bubble. It isnt, but even if it were (by were, I mean, its about to repeat the US experience), its still no big deal. I'm finding stuff selling at 10-30% discounts to the market value of the RE properties, with tax free dividends and the capital gains can be tax free as well if you sell it gradually every month (R$20,000 exemption). This is pretty attractive. Specially given the record of the bubble callers