There are so many MVNOs out there competing for business that I wouldn't worry about Tracfone going to the dark side one bit.
The wife and I were in the phone service switching dilemma this same time last year. Ditch Verizon's $50 per line and try an MVNO? We did and have been saving a ton of money. I switched over to Mint (T-Mobile network) for $20 a month - unlimited talk/text/10GB data. That price requires prepaying for a year. Zero complaints.
The wife decided she didn't like Mint/T-mobile because the service wasn't PERFECT while driving in some very rural areas (she likes to talk and drive, which I don't do), so I switched her to AT&T via Redpocket. Same price as Mint, but I think she only gets 8GB data. Redpocket allows you to choose your carrier, $20 a month for 8GB data, you have to prepay for a year for that price. We tried Verizon via Redpocket, but Verizon subcontracts to a 3rd party company (Bluegrass Wireless) for service in our area, and we didn't get that perk with Redpocket which meant we had zero service in huge swaths of Kentucky, including where we live. But AT&T with Redpocket has been working fabulous. I learned about Redpocket from posting on this forum, and I'd like to thank the guy that suggested it a hundred times over. EDIT- Redpocket prices went up to $22.50 per month (prepaid for a year), but includes 10GB of data now.
I only mention this because another poster mentioned paying $23/mo for service with 1GB data. If that's Tracfone's best deal, I wouldn't sweat it. Lots of great options out there.