An exploit is an exploit and therfore NOT good for the game. Does this fall under the category of an exploit? We don't know yet, and won't know until EA/BW puts out an official statement.
There will not be an official statement as it was set up intentionally. There is no game mechanic being exploited beyond a level 1 getting there, or a quest reset. The xp weekends were set up intentionally so as to get as many people to 50, ready for the expansion, as is possible.
To curb this would be to lessen the number of expansions, CC items and gear they could potentially sell so there really is no motivation to waste resources on this and turn potential profit into expenditures, especially for a short term "prep for the future" event.
Honestly folks, I see no exploit and see no motivation to stop this.