In the case of the 5e playtest Sorcerer no.
Because it's quite clear that the current (draft, of course) Sorcerer is mechanically more than a spellcaster: it's a spellcaster that gradually turns into a fighting machine as her spells are used up.
Look again - the sorcerer, really, isn't that far from a spell-point wizard, except that a couple of his spells are chosen by the heritage.
The bennies for running out of spell points are not huge (a couple points of melee damage and resistance to one damage type do not a "fighting machine" make). I suspect those are meant to balance against the Wizard's extra cantrip and higher magical attack rating - the idea is to keep spellcasters in play when spelled out - the sorcerer is just experimenting with other ways to do this.
The mechanic may well be the same insofar as "you can use some of your spell points to use another power, and when you run out, you get some minor abilities to keep you in action". But they won't all be melee related.