Seems that here 3G shutdown is coming in a few years too (depending on service providers - some sooner some have no plans yet) but reading form the carrier web pages. 2G on the other hand is left alone since 3G is the one which frequencies are wanted to be used for 4G. A lot of IoT and stuff need the older 2G and 3G so sone of them is often still left standing.
But, since voLTE is used only if possible, and it reverts (at least here) to 2G/3G for voice and 4G for data if not, I’m not really worried - calls will work and data will flow, just not using voLTE.
Here is a list of sunsetting 2G and 3G around the world (check your carrier for more info).