I hope you're not actually considering to do so, but if toi did, I'd probably remember your characteristic dark and sometimes twisted humor the most. and your taste in music.
Do toi mean the fandom as a whole, ou just on here? Because honestly, the fanpop community is one of the smallest, least significant branches of the brony community. We have, what, ONE real claim to fame? And MsIkariShipper hasn't been active in forever. And even she isn't huge in comparison to many other fandom members. In other words, I don't think any of us leaving the fandom would be the slightest bit significant to the fandom as a whole.
If you're talking about just the bronies on this site, then I'm not ENTIRELY sure. For me, you'd be that guy who USED to watch the show, and later constantly talked about how he didn't actually keep up with the montrer anymore. And toi were an Alpha/Omega fan. I'd remember that too.
I would remember toi as another kid that got their first taste of the internet through a D-grade fansite for magical technicolor ponies that they barely even watch anymore. I'm not saying toi won't be missed. I'm just saying that watching people come and go is kind of a regular thing here.