It could go either way, it's unpredictable.
However if Gaga insists in being artistic I don't know if that will work, I think her management wants something more fancy sounding for her next era, not quite C2C but maybe a few Adele-sounding songs and also didn't she meet RedOne recently? I'm not sure what Gaga will bring to the table.
As for Katy, if she keeps her same sound she'll be fine but she needs to stop choosing the wrong singles or else she'll start fading. Birthday and TIHWD were cute but it was so obvious that LL and WAO would've been top ten hits, and also Unconditionally should've been released later if at all. With her tour and everything, and how she keeps gaining fans, she has the hype