Has jijitsue lost its effectiveness in mma and fighting?

in mma everyone knows how to denfend subs.. at least the better fighters do.. in most cases it looks pretty stale now (both fighters cancelling each other out). it seems now most fighters who find themselfs on the bottom are trying to just get back there feet, if the person on top can defend they can just pound on u all day. also in street fighting falling to youre back and going for a sub is dangerous, you never know they might bight u or eye gouge u wile going for a limb and you'd be unable to use it.. bjj issent bad but its not king like back in ufc 1, everyone knows the secrets in mma now..