T. M. Krishna, noted Carnatic musician initiated a debate on his face book page on a recent trend in Carnatic music circles. Let me quote a part from his points:

"I have of late found that we carnatic musicians and rasikas seem obsessed with Hindustani ragas... firstly there is nothing wrong with that... but i have sensed that carnatic ragas are being taken for granted by both musicians and listeners.... in fact nobody is spending time in going into the multiple layers ...of these great creations.... somehow if an artist sings a exquisite classical heavy Asaveri the discernment to comprehend or appreciate it is sadly very very LOW... but when a Rageshree or Basant etc are sung everyone is amazed, believe this is something outstanding etc etc.. this has really saddened me..."

I consider T.M.K has put forward a valid point though a debatable one. We have to see what was the reaction in the Hindustani circles when Ustad Amir Khan sang a Carnatic Hamsadvani six decades back. If someone in the South adapts a Hindustani Raga to sound just different and 'melodious :)' for an easy applause, it's sad as T.M.K says. But if it's for getting into the multi-layers there too, but in a Carnatic style, is it the way any music gets evolved through times?
Here are two Hamsadhvani renderings, the first is by M.D.Ramanathan (a Carnatic legend) and the second is by Ustad Amir Khan
1. MDR: http://www.youtube.com/watch?v=MaJoBglWBY4&feature=related
2. Ustad Amir Khan: http://www.youtube.com/watch?v=VQMFfIpHKQE&feature=related