Tweet-sized explanation of Foreshadow: Intel chips with speculative execution erroneously use OS-private bits of not-present page table entries as physical addresses, allow reading L1-cached data from resulting location via timing side-channel.
The speed gains are marginal, and negative if you're measuring performance per watt or per area. If the Centerton microarchitecture had not been abandoned and had been heavily invested in, we'd likely have in-order, non-speculative chips competitive with Spectre-hell.
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The only real saving grace of your proposal is that in practice, in order CPUs can be usable desktop systems (source: I have an in order Atom netbook that's still useable). But usable != pleasant.
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They'd be a lot better than just "usable" if all of Intel's, AMD's, and ARM's R&D budgets over the past 15 years had been poured into them rather than into speculative foolery.
End of conversation
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