i never said there are no merits in using the spg card because there clearly are such as the ones you mentioned however in a situation like whats been going on in israel for the better part of a year where the dollar has been falling like a hot potato i dont think its a "no brainer" to use the card over changing money there is potential to save a lot by changing it all right away and thats a decision the one visiting has to make
I guess I'm not understanding your argument...If you're so sure that the dollar will fall during a short period of time you should be investing in the foreign exchange markets, not changing money in Israel!
The dollar has just as good of a chance of going up as it does of going down in the short-term versus any given currency based of a myriad of factors, that has nothing to do with whether you should spend cash or use a credit card when traveling.
Just to add another reason to use a credit card while traveling, is that you're not out anything if you get pickpocketed, the same can't be said of cash.