but that won't be proven right out of the box. it will take time, experimentation, and speculation on the SC before the market will "trust" the SC, if ever at all. in the meantime, expect the true value of 1 scBTC < 1 BTC.
this is another thing you don't understand, the 1:1 sidechain "market" doesn't have to prove itself, and in fact it is very likely there is no such speculation that you are referencing.
the likeliest candidates to sidechains are UTILITY chains on a 1:1 peg issuing no assets. they are to be used "in and out" or with only a fraction of the user's BTC trusted to it.
it seems very probable to me these sidechains can be proven valuable and secure "out of the box". assuming the sidechain concept (two-way peg, merged mining, etc.)has been implemented, tested and vetted for some time. From there on, candidate sidechain essentially leverages this implementation and present a code that discloses the exact behaviour of the chain which is then reviewed extensively by the community before an "official launch". Additionaly, we also have to consider that the SC could also be leveraging existing technologies or concepts that have been confirmed to work successfuly in a different environment.