I plan to pay the full price but I do think half price would be a good gesture on SE's behalf and would also entice players to stick around and support the game.
I won't be surprised if SE don't make an announcement in the next few weeks to say the subscription will be half price.
I did also think that maybe people will complain when they later increase the price to full price, but as long as SE are 100% clear about the game being at half price then people can't really complain.