Vendors can still order new Skylake-X parts, but the process of discontinuing the lineup has begun and it is not as if anyone is going to miss them.
On 23 January 2021 vendors will not be able to order CPUs. Depending on how many orders Intel receives, however, the discontinued chips could theoretically still ship out all the way through July 9, 2021 but in this case that is unlikely.
Affected models include:
Core i7 9800X
Core i7 9820X
Core i9 9900X
Core i9 9920X
Core i9 9940X
Core i9 9960X
Core i9 9980XE
Several Xeon W series workstation processors are also being discontinued, including the 2102, 2104, 2123, 2125, 2133, 2135, 2145, 2155, 2195, and 2175.
The chips were widely seen as overpriced and their discontinuation is hardly surprising, as Intel has already had its 10th-generation Cascade Lake-X chips, including the flagship Core i9-1090XE, on the market for some time.
Intel is probably waiting until a whole new motherboard and socket is ready, rather than rushing out another HEDT processor series based on the aging 14nm process.