Modern stage of development of public transport systems in large cities is bearing the hallmarks of bifurcational period of developing under the impact of a number of factors to which we can refer emerging of new sharing-based forms of mobility, digital platforms, sophistication and customization of customers requirements put forward to services provided. Potential outcomes are associated with implementation of one of scenarios of further city public passenger transport (hereinafter referred to as "PPT") system development, namely: evolutionary development of existing city PPT logistics system; "quality leap" towards PPT ecosystem engineering on the basis of (i) customer centricity, (ii) improvement of subsystems integratedness level and (iii) activization of using the cuttingedge transportation and management technologies). However, transition to PPT ecosystem-based organization is associated with serious reformation of existing management system whereupon it is required to define (i) expediency of such transition and (ii) composition and boundaries of city PPT ecosystem. The present paper demonstrates methodological tool intended to substantiate the decision to fulfill transition to ecosystem-based PPT organization on the principles of valuebased approach which is envisaging the use of comparative assessment of the level of added value formed by (i) each of city PPT logistic system elements and (ii) anticipated level of customers satisfaction by services provided by the system under study.