After having played FFXIV and WoW and seeing how much more content came from the companies having a steady stream of game income, Destiny having a system like that would be amazing.
Instead of 3-4 Events per year like the harrowing, there could be a monthly event. Bungie could hire more devs and artists to create armor and weapons. Clans could create living spaces/buy areas for housing (having a clan cryptarch and bounty machine that lets you pick up all the bounties.)
If you would be more open to the idea of having a massive expansion every two years and between those having mini expansions and events all the time, you might find that paying 60$ for the base large expansion and paying say $8 a month to have more activities to do is totally worth it.
Running expansions off microtransactions is not a business model that is sustainable and Bungie doesn't have anything to fall back on other than Destiny right now.
Edit: The console peasants are angry!!
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I hope they do it. This game would die so incredibly fast, if you blinked, you'd miss it.