natural
as a matter of course
Structure
- Verb[ て ] ＋ 当然だ
- いAdj[ くて ] ＋ 当然だ
- なAdj[で] ＋ 当然だ
does “Verb[ て ]” mean て-form ? If so, I think there is a problem with the sentence
アイディアがいいから、人気が出てて当然だ。
Is there one too many て or is it a contraction of 出ていて ? I’m asking since there is no other example sentence that uses ていて当然だ, including on japanesetest4you
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Hey 
Yes, it is contraction from ていて. 
I have added non contracted forms as alternative answers.
Cheers!
Edit:
I changed it to あって当然 because it sounds more natural in this case
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