a doubt over the decision of referee

Few months back I communicated a paper. I got the reviewer's report in a positive direction. But he asked us to add some results if we wish and in the end he wrote:

"I leave it to the decision of the editor for further process."

Now I got a mail regarding this from the editor:

If you wish you may send a revised version according to the suggestion of the referee.

My question is will they reject our manuscript if we are not interested in updating our work as it will long time to finish. I am in dilemma. As the editor started his words with "if you wish". What could be the possible consequences if we are not interested in sending revised work.