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How many respondents do you have at this moment? How many respondents do you think you need to be able to generalize the results?
You should take care of the validity of your research though; I'm not sure where you are collecting the respondents, but if all your data comes from Bitcointalk.org users, this has negative effects on your validity. (I can imagine that Bitcointalk.org members for example use their PC quite often and therefore have software wallets (and know how to use USB-sticks for back ups etcetera. There might also be people with less knowledge of PC's which only have a hardware wallet or a mobile Phone to make use of their bitcoins. The latter group is not yet involved in your research).
You should take care of the validity of your research though; I'm not sure where you are collecting the respondents, but if all your data comes from Bitcointalk.org users, this has negative effects on your validity. (I can imagine that Bitcointalk.org members for example use their PC quite often and therefore have software wallets (and know how to use USB-sticks for back ups etcetera. There might also be people with less knowledge of PC's which only have a hardware wallet or a mobile Phone to make use of their bitcoins. The latter group is not yet involved in your research).
I have about 70 completely finished surveys (although about 200 respondents started the survey, they didn't answer all the questions), but I want at the very least 100 respondents. I have this survey on various bitcoin forums so validity isn't the problem.
And btw... mobile wallets are still software wallets
