Mearls mentioned recently that there will be a feedback collection round probably at the beginning of 2015, and IIRC they have been talking about the possibility to update the rules of 5e once a year.
If they incorporate them into new prints of the PHB, would you re-buy the PHB to have it up-to-date (or how much updated does it have to be for you to buy it again)?
I would be fine with errata PDFs and updates to Dungeonscape/the PRD as necessary, yearly "targeted updates" as described by Mearls, and maybe updated core hardbacks every five years similar to a "point-five" edition, but what I would hope is that this would be an /ongoing/ solution, with the game evolving organically over time rather than being subject to a six-to-eight-year reboot cycle.
I would buy new core books every /five/ years if if meant my supplementary material never became obsolete or required baseline conversion. Yes, I would do that.
IMO they should implement a searchable 5e SRD like d20pfsrd, with the core mechanics (at least). This SRD is updated and has the latest fixes. So even if you're gaming mostly with books, you can quickly search the SRD if you suspect something has been altered, etc.
It's easier than scanning a PDF (the errata, or the updated Basic). Also much easier than having to print yearly errata pages and slip them into your PHB![]()