Thanks for the reply!
I had read up on this before but never actually got around to figuring out the details. And I have to admit that when I started playing around with these forecasting capabilities I completely forgot about this option. I guess I rather invest the time once now to learn R rather than reaching the limits of what I can do in Tableau itself in a few weeks and then having to switch. Thanks again!
You're welcome. I think the "way to go forward" is getting really "acquainted" with the forecast functionality available in Tableau and knowing exactly what the "boundaries" are and at the same time knowing where R comes in and has added value for your scenario. The most important thing about an approach is , as you mentioned, not having to any "re-work" on the road ahead!;)