Since I was quoted, I think I will respond.
By all means, continue with the interviews. But let me ask this, at the same time you are doing those interviews, do you think other people could answer the exact same questions with an online survey?
Which is my point. Every research methodology has its good and bad attributes. The key is to recognize the strengths and use them to fulfill your objectives.
I have no idea if I would recommend having or not having a survey without knowing your objectives. And while interviews can have great depth, they have no breadth. Surveys can provide the breadth and can be very valuable to confirm the data you obtained from your interviews.
And for the record, a bad interviewer can absolutely ruin the data received from the interview. Just as a poorly written survey can ruin its data.