Intel Macs will minimum be supported for 5 years, I'd bet 7. The larger frame apple silicon iMac is rumored to take until Fall 2021 or even Winter 2022 until it's released. The smaller (potentially 24") apple silicon iMac is rumored for this spring. If your intention is to get the larger frame iMac, it could be a bit of a wait. Either way, again, support will be around for a while. If form factors and things like that are a huge factor for you, waiting might be prudent. For me it's a machine I use for work, and needed one this year. I'm very happy with my purchase.