Even someone who wouldn't hit the proposed limits. People will be discouraged going down this path period, and that will lead to less investment all around. This exclusion works out for pretty much everyone and should be expanded to more industries in which it would bring the same benefits it does here, not curtailed.
Why would paying taxes on over $1M of gains discourage people from going into the real estate business any more than it discourages anyone to go into any business?
The reality is, real estate is a tax haven for the wealthiest people. The tax benefits have inflated the prices well beyond the value of the assets alone. This creates a barrier for entry for many people, keeping the wealth and benefits almost exclusively within the top 10% of earners in this country. Furthermore, it has well outlived its originally intended purpose, which was to motivate people to buy without worrying about paying over 50% (and up to 77%) in taxes. Now, it may very well have economic benefits. If the trade off is worth it in the big picture, expand it to all investments. Not only will that make the RE point of entry more accessible to more people as the demand from the wealthy drops off, but other markets should experience great growth from the influx of like-kind investments. Keeping it as is just doesn't make sense to me.