Hi, firstly no the nvq will not be useless it will continue to hold the same validity of qualification regardless of the more disparaging posts you may read on here.
The new certificate & dimplomas launched fully from the beginning of this August & September. Up until those points nvq registrations were still openly available and you have two years in which to complete your level xx
If you'd like to find out about making a change ask your provider what your choices are - the main diffference other than unit content is the introduction of GLH guided learning hours where you'll be expected to attend tutoring at college/uni.
Hope this helps