The plans are still relevant. What I suggest is that we'd allow pro apps to be downloaded and installed for free, but updates would still require a subscription plan. Effectively it's the same as now, except you can try them without paying and choose to pay only if you're actually using them and have data that needs to be preserved, making it impossible to just re-install a pro app again. If this works I would encorage Market vendors to follow the same model - letting users try their products and pay when/if modules are in active use and vendor is issuing updates.