They have to bring everything up to date not only for graphics. The best way to "save" RuneScape IMHO is to rework a lot of things from the start. Like ... delete them and do them from square 1. Most of the mechanics are outdated, some of the skills are outdates even in-game speaking (smithing, d'oh). If they want to milk the cow - sure add a new skill. If they want the game to survive AND attract AND keep new players - reconstruct it (no Construction pun intended).