Says a lot that a bunch of posters can't think of or say anything bad about May.
For how much "XY is the new AG," it's too bad Serena never reached May's level.
Serena is more popular than May, but your opinion is your own. Not saying that May is bad, but Serena has become one of the most popular characters in the franchise history.
Pretty sure it's over since Ash is going to the next region and the concept art shows him with the grass trial girl.
Stuff will never be the same, they will always replace the pokegirl each region.
That was game artwork, not anime art and the status quo is breaking so there is a strong chance she stays.