Nah, I'll move over when everyone else is no longer using WhatsApp. Then again, you weren't talking to me.
EDIT: And only 3 people still on WhatsApp? LMAO, sure, unless you only have 8 contacts.
I have a long scroll wheel on Telegram.

No seriously, from like two years ago, when it was maybe 3/4 of us, to now over ~50 people within the last 6 months, it's been quite a change. One of the main ways we got people over is due to:
1. The cloud based backup, WhatsApp makes 7 backup files, those can be huge. For me with 2 active groups it's about 70MB each, which is 500MB of space. On my old 16GB storage phone, that's quite substantial. If you include all the media, it gets even bigger, meanwhile on Telegram I can tell it to remove from my local device after x amount of days, yet still have access to it by scrolling up.
Telegram's app is also substantially smaller:

15 MB.
2. At uni, WhatsApp doesn't work properly behind the proxy, Telegram I can set the proxy.
Again, I am probably a lot younger than you, we try out whatever is new.
3. Is mostly me, I love having a desktop client that I can run in the background, web.whatsapp is just huge/clunky to remember which window has the tab. Plus easy file sharing between desktops, could probably also use a GDrive shared folder instead, but that's more effort.
4. Themeing. Does WhatsApp have a dark mode yet?
And there are a host of other "little" things, like how much easier it is to attach images, better galleries, the ability to swipe back to the main chat page, groups having the ability to have discussion on a post rather than cluttering the main group, sitckers (yes, I actually convinced quite a few girls to sign up through this, still unsure why), and up until recently the playback of voice notes in succession and then for work group the double playback speed and we have a bot converting speech to text (though that's a hit and miss depending, but usually gets the point across).
This is also pretty cool:
https://telegram.org/blog/contacts-local-groups
Will probably create one when I go back to uni, will be interesting to see the use. There are a ton of nearby groups just here in atlantic seaboard CT.
The add nearby people feature is also great, have already used it once now.