Disagree. Look at Sawstop. It took years to even get to the patent filing phase. Then he tried to get companies to adopt it. They didn't. So he spent years building a company and manufacturing base to support it. By the time he finally got things into stores and had a chance to pay back his investment the patent would have expired under your idea. There would have been zero incentive to do all that investment and the technology would have never become available.

Your five year rule would harm anyone not already extremely wealthy. It would further incentivize corporations to maintain control over markets. It would also create a situation where companies would be trying to recoup all their investment costs in that 5 year period which would result in extremely high prices. Like the pharma companies on steroids charging a 5000% markup.