They are not EOL, the problem with VEGA is they are down turned the production simply because the profit is none existent and also the demand poor.
So people like Sapphire still make them, but they charge a lot more.
Powercolor have decided to really reduce their inventory and pretty much stop making VEGA as they feel it loses them money, now they can move production more onto their own product lines like chassis, Vega NANO (their own card, not official AMD product), RX series and I believe Powercolor will do some more work on their own sound card technology.
As with all things if you make and sell an item which makes low or no profit, to continue doing so would bankrupt the company and lets face it if we lost Powercolor AMD would be in a bad place, especially as XFX seem to be very quiet and none existent these days.
VEGA will also get a nanometer reduction, but of course it is believed it won't be consumer level and just for AI, corporate and professional customer bases. The big next thing from AMD is NAVI in late 2019. For now they can focus on the sub £300 market with RX series and from time to time bang out a few VEGA cards for good measure.