No. They can usually get back on an annual cycle if you deadhead them. Some plants can actually produce so much seed that they don't bloom much the following year. Removing the wilted flowers before they produce seed should break the cycle. For information, go to the link below and click on "Sanitation & Deadheading".

Another technique some people use is to remove some flower buds before they open to increase the quality of bloom. The critical element is, you must wait until you can tell the difference between flower buds and foliage buds. You only want to reduce the number of flower buds.

Still other people contain the size of a plant by removing foliage buds before they open on the top of the plant. Again, you must wait until you can tell the difference between foliage and flower buds.

Here is a link that might be useful: How to deadhead azaleas.