It's already available but mostly undesirable. There needs to be an obvious commercial advantage for a customer to choose to increase the cost of his new equipment by x$ per unit. Over the last 15 years Ive seen synthetic vision demonstrations on both Honeywell and Collins systems but they offer no advantage over Autoland/HUDLS. Even HUDLS is not that popular compared to AL capability as most products are initially designed with AL and then HUDLS offered as an option. If your fleet is equipped with HUD for a.n. other reason (normally someone advancing their career on the basis of added situational awareness) then HUDLS can be argued to be part of that philosophy. But the OEM isn't going to discount the AL capability if it's standard so you only save on maintenance and waste capability if you ignore it.
Then when it comes to fleet replacement you are trying to offload aircraft with a capability that has a different training requirement so anyone in the market is going to look at the more mainstream versions of the same product.