OP, don't be pressured by "keep up with the Joneses" technical arguments. If you are happy with what you have, enjoy... and enjoy keeping any spare cash in your pocket too.
That said though, I thought I read- perhaps in another thread- that you have Comcast as cable provider. That's what I have too. And in the interests of a "money is tight" scenario, I'll point you again back to my post #15. While there's some hardware to buy to make that go, you can weigh the one-time cost of those options against whatever you might be paying for leased boxes from Comcast. Those box costs can add up quickly.
Refurb or used

TV4 (or maybe the DirecTV now deal for a 4K- approx. $105) + a refurb Silicon Dust HDHomeRunPrime box (<$100) can prove cheaper than $8-$15+ cable box lease fees over approx. 10-20 or so months. And once you cross that break-even hurdle, it's much cheaper to keep watching Comcast via your

TV(s).
No pressure here- just offering you an idea that might save you some money AND get you a newer

TV too. I am delighted with using my

TV(s) as THE cable box for Comcast cable service.
Otherwise, the biggest reason to upgrade now or soon is any 1+ apps that you might really enjoy that will never come to the

TV3.