I hacked our first Series1 by adding a second HDD. I've been hacking them ever since and currently have a 4TB Premiere XL and a 3TB bolt both with LT subs. I had to install a new 3TB drive in the Bolt a couple of months ago when the original died. (I was glad I squirreled one away before they stopped making them.) Lost all of the recordings, but had a lot backed up on the Premiere and it wasn't the end of the world.
So having been there since the beginning and having spent way too many late-night hours getting them to do things I never thought I could (or TiVo probably ever thought about), I too will be sad when the day comes that either of my last boxes dies... because I won't "invest" in a new one.
There's nothing like a TiVo when it comes to convenience. Nothing. I've tried to cut the cord with multiple different devices and sources, but always come back to TiVo. We're currently with Comcast/Xfinity and we know that the end of cable card support is coming. Explored OTA antenna, etc. and if/when the day comes I might drop a few dollars on a OTA TiVo for fun, but it wouldn't be the center of our TV watching universe like it is now.
I've lost track of the subs we have for streaming services. The wife and I were talking about it when we were using the Apple TV 4K the other night. (Tried other streamers, but keep coming back to the ATV.) Before Steve Jobs passed he commented about TV, saying "I cracked it". Rather than the physical TV some thought he meant, it appears that he was referring to a voice-controlled environment. A world where all we needed to do was ask for what we wanted. It's pretty much come true. I can tell Siri, show me "[insert almost anything available - TV shows, Music, Podcasts, etc. - here] and it's suddenly listed in front of me, ready to play. It's not limited to what Apple offers either. It "knows" all of the streaming services we have currently and shows everything that's available, no matter what the source. The future, Steve's future anyway, is basically here.
Whatever is next, it just won't be as convenient as TiVo. I will miss that. Hopefully we can enjoy it for a little while longer.