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\subsubsection{The Htt coupling}  As mentioned above, a centre-of-mass energy of 500 GeV cannot compete with the HL-LHC for the Htt coupling measurement. To reach a similar accuracy in $\epem$ collisions as at HL-LHC (less than 5\%), the upgrade of either ILC up to $\sqrt{s}=1$~TeV or CLIC up to $\sqrt{s}=3$~TeV is needed. A precision of 4\% on the Htt coupling would be achieved with an integrated luminosity of 1~$\inab$ (ILC) or 2~$\inab$ (CLIC). These long-term, multi-billion-dollars, upgrades can probably not be justified by the mere possibility of approaching the HL-LHC precision for this coupling, at least  a decade after then end of HL-LHC collisions. \subsubsection{The HHH coupling}