Depends on your personal circumstances.
You have iirc 36 months/3 years to complete the IR and CPL from passing all the ATPL theory exams.
You should plan out how long you expect to spend on ATPL theory, e.g. perhaps 6 months full-time. Then plan how long the CPL and IR will take - don't count solely on minimums! I'd suggest 3-4 months in total, maybe 5-6 if you are in a busy yet disorganised school. Also when will you be giving up work, if at all?
If you do start the present JAR-flavour ATPL theory *and* there are syllabus changes bought about my EASA once they take up FCL, then there will probably be provision to carry your through the JAR syllabus and exams until completion. In brief, don't worry about this being a factor.