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\subsection{Higgs physics at higher energy}  and it It  is not yet excluded to extend it the centre-of-mass energy of the ILC  by another factor of two towards $\sqrt{s} =$ 1 TeV, with a significant cost increase of about five billion dollars over the baseline project. Another linear collider project, CLIC~\cite{cite:CLICDR}, could also take over for the high-energy physics programme all the way to $\sqrt{s}=$ 3 TeV, which TeV. It  would require, however, a prohibitively high prohibitively-high  electrical power ($\sim 600$~MW). of $\sim 600$~MW.     The foreseen energy upgrade of TLEP is of another, unique, and more ambitious, nature. It would consist in re-using the 80-to-100 km tunnel for a very-large-energy large hadron collider (VHE-LHC). If instrumented with magnets of 15 T, pp collisions would be produced at a centre-of-mass energy of 80 to 100 TeV. For completeness, pp collisions with a centre-of mass energy of 33 TeV, which would be obtained by re-using the LHC tunnel for a high-energy hadron collider (HE-LHC), are also addressed here.         To reach a similar accuracy in $\epem$ collisions, the upgrade of either ILC up to $\sqrt{s}=1$~TeV or CLIC up to $\sqrt{s}=3$~TeV. 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. They are discussed in the next subsection.