No, you can lucid dream! 
Think positive and don't think that something destroys it something, in fact, it's be better not to worry about length entirely! I once had pretty long dream length dry spell and was trying to find the 'problem', but then i had long lucid when i just stopped thinking about it and was like "Whatever length will be, i will enjoy it". 
By the way, how you do reality checks? If you do them on auto, then you are doing it wrong, mindset is important for reality checks and you should actually believe that you might be dreaming when you do them and look around for anything weird. Also after doing reality checks and it shows you that you are awake, never think anything like "No, i am not dreaming", think "When i will be dreaming i will do reality check" or something along that. 
Check out this thread: http://www.dreamviews.com/dild/13212...ods-dilds.html
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